diff --git a/src/client/web/src/components/__test__/browser.test.tsx b/src/client/web/src/components/__test__/browser.test.tsx
index 80a0154..00808c3 100644
--- a/src/client/web/src/components/__test__/browser.test.tsx
+++ b/src/client/web/src/components/__test__/browser.test.tsx
@@ -2,7 +2,8 @@ import { mock, instance, verify, when, anything } from "ts-mockito";
 import { List } from "immutable";
 
 import { Browser } from "../browser";
-import { ICoreState, newWithWorker } from "../core_state";
+import { initUploadMgr } from "../../worker/upload_mgr";
+import { ICoreState, newState } from "../core_state";
 import { updater } from "../state_updater";
 import { MockWorker } from "../../worker/interface";
 import { MockUsersClient, resps as usersResps } from "../../client/users_mock";
@@ -13,8 +14,9 @@ describe("Browser", () => {
   const initBrowser = (): any => {
     const mockWorkerClass = mock(MockWorker);
     const mockWorker = instance(mockWorkerClass);
+    initUploadMgr(mockWorker);
 
-    const coreState = newWithWorker(mockWorker);
+    const coreState = newState();
     const usersCl = new MockUsersClient("");
     const filesCl = new MockFilesClient("");
 
diff --git a/src/client/web/src/components/__test__/pane_login.test.tsx b/src/client/web/src/components/__test__/pane_login.test.tsx
index 0c59471..22fa3eb 100644
--- a/src/client/web/src/components/__test__/pane_login.test.tsx
+++ b/src/client/web/src/components/__test__/pane_login.test.tsx
@@ -3,7 +3,8 @@ import { mock, instance } from "ts-mockito";
 
 import { User, UploadInfo } from "../../client";
 import { AuthPane } from "../pane_login";
-import { ICoreState, newWithWorker } from "../core_state";
+import { ICoreState, newState } from "../core_state";
+import { initUploadMgr } from "../../worker/upload_mgr";
 import { updater } from "../state_updater";
 import { MockWorker, UploadState, UploadEntry } from "../../worker/interface";
 import { MockUsersClient, resps as usersResps } from "../../client/users_mock";
@@ -13,8 +14,9 @@ describe("Login", () => {
   test("login", async () => {
     const mockWorkerClass = mock(MockWorker);
     const mockWorker = instance(mockWorkerClass);
+    initUploadMgr(mockWorker);
 
-    const coreState = newWithWorker(mockWorker);
+    const coreState = newState();
     const pane = new AuthPane({
       login: coreState.login,
       msg: coreState.msg,
diff --git a/src/client/web/src/components/__test__/panes.test.tsx b/src/client/web/src/components/__test__/panes.test.tsx
index 17069f2..8ee09ca 100644
--- a/src/client/web/src/components/__test__/panes.test.tsx
+++ b/src/client/web/src/components/__test__/panes.test.tsx
@@ -1,7 +1,8 @@
 import { mock, instance } from "ts-mockito";
 
 import { Panes } from "../panes";
-import { ICoreState, newWithWorker } from "../core_state";
+import { ICoreState, newState } from "../core_state";
+import { initUploadMgr } from "../../worker/upload_mgr";
 import { updater } from "../state_updater";
 import { MockWorker } from "../../worker/interface";
 
@@ -9,8 +10,9 @@ describe("Panes", () => {
   test("closePane", async () => {
     const mockWorkerClass = mock(MockWorker);
     const mockWorker = instance(mockWorkerClass);
+    initUploadMgr(mockWorker);
 
-    const coreState = newWithWorker(mockWorker);
+    const coreState = newState();
     const panes = new Panes({
       panes: coreState.panes,
       admin: coreState.admin,
diff --git a/src/client/web/src/components/__test__/state_mgr.test.tsx b/src/client/web/src/components/__test__/state_mgr.test.tsx
index b329440..d37d9f0 100644
--- a/src/client/web/src/components/__test__/state_mgr.test.tsx
+++ b/src/client/web/src/components/__test__/state_mgr.test.tsx
@@ -2,10 +2,11 @@ import { List, Set, Map } from "immutable";
 import { mock, instance } from "ts-mockito";
 
 import { StateMgr } from "../state_mgr";
+import { initUploadMgr } from "../../worker/upload_mgr";
 import { User, UploadInfo } from "../../client";
 import { MockFilesClient, resps as filesResps } from "../../client/files_mock";
 import { MockUsersClient, resps as usersResps } from "../../client/users_mock";
-import { ICoreState, newWithWorker } from "../core_state";
+import { ICoreState, newState } from "../core_state";
 import { MockWorker, UploadState, UploadEntry } from "../../worker/interface";
 
 describe("State Manager", () => {
@@ -15,6 +16,7 @@ describe("State Manager", () => {
 
     const mockWorkerClass = mock(MockWorker);
     const mockWorker = instance(mockWorkerClass);
+    initUploadMgr(mockWorker);
 
     const mgr = new StateMgr({}); // it will call initUpdater
     mgr.setUsersClient(usersCl);
@@ -25,7 +27,7 @@ describe("State Manager", () => {
       // no op
     };
 
-    const coreState = newWithWorker(mockWorker);
+    const coreState = newState();
     await mgr.initUpdater(coreState);
 
     // browser
@@ -121,7 +123,7 @@ describe("State Manager", () => {
 
     const mockWorkerClass = mock(MockWorker);
     const mockWorker = instance(mockWorkerClass);
-    const coreState = newWithWorker(mockWorker);
+    const coreState = newState();
 
     const mgr = new StateMgr({}); // it will call initUpdater
     mgr.setUsersClient(usersCl);
diff --git a/src/client/web/src/components/core_state.ts b/src/client/web/src/components/core_state.ts
index a195b61..a48c278 100644
--- a/src/client/web/src/components/core_state.ts
+++ b/src/client/web/src/components/core_state.ts
@@ -1,17 +1,13 @@
 import { List, Set, Map } from "immutable";
 
-import BgWorker from "../worker/upload.bg.worker";
-import { FgWorker } from "../worker/upload.fg.worker";
 import { UploadEntry } from "../worker/interface";
 
 import { BrowserProps } from "./browser";
 import { PanesProps } from "./panes";
 import { LoginProps } from "./pane_login";
 import { AdminProps } from "./pane_admin";
-
 import { MsgPackage } from "../i18n/msger";
 import { User, MetadataResp } from "../client";
-import { initUploadMgr, IWorker } from "../worker/upload_mgr";
 
 export interface MsgProps {
   lan: string;
@@ -36,15 +32,7 @@ export interface ICoreState {
   msg: MsgProps;
 }
 
-export function newWithWorker(worker: IWorker): ICoreState {
-  initUploadMgr(worker);
-  return initState();
-}
-
 export function newState(): ICoreState {
-  const worker = window.Worker == null ? new FgWorker() : new BgWorker();
-  initUploadMgr(worker);
-
   return initState();
 }
 
diff --git a/src/client/web/src/components/state_mgr.tsx b/src/client/web/src/components/state_mgr.tsx
index b44acc7..4f09e3a 100644
--- a/src/client/web/src/components/state_mgr.tsx
+++ b/src/client/web/src/components/state_mgr.tsx
@@ -1,5 +1,9 @@
 import * as React from "react";
 
+import { initUploadMgr } from "../worker/upload_mgr";
+import BgWorker from "../worker/upload.bg.worker";
+import { FgWorker } from "../worker/upload.fg.worker";
+
 import { updater } from "./state_updater";
 import { ICoreState, newState } from "./core_state";
 import { RootFrame } from "./root_frame";
@@ -7,8 +11,8 @@ import { FilesClient } from "../client/files";
 import { UsersClient } from "../client/users";
 import { IUsersClient, IFilesClient } from "../client";
 
-export interface Props { }
-export interface State extends ICoreState { }
+export interface Props {}
+export interface State extends ICoreState {}
 
 export class StateMgr extends React.Component<Props, State, {}> {
   private usersClient: IUsersClient = new UsersClient("");
@@ -17,6 +21,8 @@ export class StateMgr extends React.Component<Props, State, {}> {
   constructor(p: Props) {
     super(p);
     this.state = newState();
+    const worker = window.Worker == null ? new FgWorker() : new BgWorker();
+    initUploadMgr(worker);
     this.initUpdater(this.state); // don't await
   }